Effect of Lithium/Transition‐Metal Ratio on the Electrochemical Properties of Lithium‐Rich Cathode Materials with Different Nickel/Manganese Ratios for Lithium‐Ion Batteries

Konishi, Hiroaki; Terada, Shohei; Okumura, Toyoki

doi:10.1002/slct.201902485

Cited by 3 publications

(3 citation statements)

References 41 publications

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“…The capacities achieved were ~140 mAh/g (15 mA/g), ~64 mAh/g (30 mA/g), and ~57 mAh/g (45 mA/g). The differential capacities of the cathode materials showed all peaks decreasing their intensities with the increase of the current density; additionally, a degradation of the voltage occurred when the current density increased [53,54]. These reductions of electrochemical performance could be explained by considering that, at high current densities, the amount of lithium insertion/extraction is affected due to the structure's surface not allowing to Li ions to leave their sites, resulting in low capacities [46].…”

Section: Resultsmentioning

confidence: 99%

Effect of x on the Electrochemical Performance of Two-Layered Cathode Materials xLi2MnO3–(1−x)LiNi0.5Mn0.5O2

et al. 2022

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In our study, the cathodic material xLi2MnO3–(1−x)LiNi0.5Mn0.5O2 was synthesized by means of the co-precipitation technique. The effect of x (proportion of components Li2MnO3 and LiNi0.5Mn0.5O2) on the structural, morphological, and electrochemical performance of the material was evaluated. Materials were structurally characterized using X-ray diffraction (XRD), and the morphological analysis was performed using the scanning electron microscopy (SEM) technique, while charge–discharge curves and differential capacity and impedance spectroscopy (EIS) were used to study the electrochemical behavior. The results confirm the formation of the structures with two phases corresponding to the rhombohedral space group R3m and the monoclinic space group C2/m, which was associated to the components of the layered material. Very dense agglomerations of particles between 10 and 20 µm were also observed. In addition, the increase in the proportion of the LiNi0.5Mn0.5O2 component affected the initial irreversible capacity and the Li2MnO3 layer’s activation and cycling performance, suggesting an optimal chemical ratio of the material’s component layers to ensure high energy density and long-term durability.

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Section: Resultsmentioning

confidence: 99%

Effect of x on the Electrochemical Performance of Two-Layered Cathode Materials xLi2MnO3–(1−x)LiNi0.5Mn0.5O2

et al. 2022

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“…cathode materials have intrinsic bottlenecks that restrict the energy performance of LIBs . Li‐ and Mn‐rich layered oxides, composed of Li 2 MnO 3 and LiMO 2 (M=Ni, Co, Mn) components, have an ultrahigh reversible capacity (>250 mAh g −1 ) and are supposed to be feasible candidates to satisfy the demand for high‐energy LIBs . The extraordinary capacity of Li‐ and Mn‐rich material is ascribed to the oxygen redox reaction induced by the electrochemical activation of the Li 2 MnO 3 component .…”

Section: Introductionmentioning

confidence: 99%

“…[2][3] Li-and Mn-rich layered oxides, composed of Li 2 MnO 3 and LiMO 2 (M = Ni, Co, Mn) components, have an ultrahigh reversible capacity (> 250 mAh g À 1 ) and are supposed to be feasible candidates to satisfy the demand for high-energy LIBs. [4][5][6] The extraordinary capacity of Li-and Mn-rich material is ascribed to the oxygen redox reaction induced by the electrochemical activation of the Li 2 MnO 3 component. [7][8] Nevertheless, oxygen redox inevitably leads to structural instability and lattice oxygen release from the surface, [9] which results in undesirable battery performances, including low initial coulombic efficiency, poor rate capability and voltage and capacity fade.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance of Li‐ and Mn‐Rich Cathode Materials by Particle Blending and Surface Coating

et al. 2020

ChemistrySelect

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A Li‐ and Mn‐rich material Li1.18Mn0.55Ni0.18Co0.09O2 (LMR) exhibits a high specific capacity; however, this material has serious problems, including a poor rate capability and limited cycling life. A jet crushing method is used to break micron‐sized LMR particles synthesized by a solid‐state reaction into nano‐sized particles. Compared to micron‐sized particles, nano‐sized LMR particles possess a higher rate capability due to shorter Li+ diffusion pathway, but also an increase in side reactions with the electrolyte leads to poorer cycling performance. Herein, we propose a material engineering strategy that combines micron‐ and nano‐sized particle blending and a cerium oxide (CeO2) surface coating modifications to enhance the electrochemical performance of LMR material. X‐ray diffraction (XRD) patterns and transmission electron microscopy (TEM) images demonstrate that the cubic structure of CeO2 is uniformly distributed on the surface of LMR, which is supposed to suppress the electrode/electrolyte side reactions by preventing electrode particles from being directly exposed to the electrolyte. As a result, the discharge capacity of the modified LMR material is 153.1 mAh g−1 at 5 C compared to 139.1 mAh g−1 with the pristine material. The capacity retention of the modified material is 82.8 % after 200 cycles at 1 C, which is higher than the 77.1 % capacity retention of the pristine material. X‐ray photoelectron spectroscopy (XPS) reveals that the CeO2 coating layer has a significant role in mitigating oxygen release from the surface of the LMR material during cycling.

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Regulating the Intralayer Cation Disorder in Layered Lithium‐Rich Cathodes to Improve Cycle Performance

Cai,

Cao

et al. 2024

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The Li/Mn ordered structure of lithium‐rich (LR) cathodes leads to the heterogeneous Li2MnO3 and LiTMO2 components, readily triggering structural degeneration and performance degradation in long‐term cycling. However, the lack of guiding principles for promoting cation disorder within the transition metal (TM) layers has posed a persistent challenge in designing homogeneous layered LR cathodes. Herein, the (Li + Mn)TM content in the TM layer as a criterion for the design of cation‐disordered layered LR cathodes is proposed. The intralayer cation disorder can be achieved by tuning the (Li + Mn)TM content less than 0.5 combined with incorporating the solute ions with suitable ionic radii. For a multicomponent LR nickel cobalt manganese (LRNCM) oxides system, multiscale structural analyses reveal that cation‐disordered layered Li1.1(Ni0.6Co0.1Mn0.3)0.9O2 (LR613) exhibits enhanced compositional homogeneity and higher Rm symmetry. The developed LR613 cathode undergoes a solid‐solution reaction during Li+ deintercalation and mitigates voltage decay during cycling. It is elucidated that intralayer cation disorder effectively alleviates microstrain within the cathode structure and enhances overall structural stability. This comprehensive understanding of the composition‐structure‐electrochemical behavior relationship inspires the development of durable cation‐disordered layered LR cathodes through composition tuning.

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Effect of Lithium/Transition‐Metal Ratio on the Electrochemical Properties of Lithium‐Rich Cathode Materials with Different Nickel/Manganese Ratios for Lithium‐Ion Batteries

Cited by 3 publications

References 41 publications

Effect of x on the Electrochemical Performance of Two-Layered Cathode Materials xLi2MnO3–(1−x)LiNi0.5Mn0.5O2

Effect of x on the Electrochemical Performance of Two-Layered Cathode Materials xLi2MnO3–(1−x)LiNi0.5Mn0.5O2

Enhanced Electrochemical Performance of Li‐ and Mn‐Rich Cathode Materials by Particle Blending and Surface Coating

Regulating the Intralayer Cation Disorder in Layered Lithium‐Rich Cathodes to Improve Cycle Performance

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